Compressed-air-locomotive heater.



PATENTED JULY 7, 1903',

w. R. PRATT.

COMPRESSED AIR LOGOMQTIVE HEATER.

APPLIOATIOH FILED OUT. 15, 1901.

N0 MODEL.

,15! My'invention relates to apNlT e TA whom, it ma concern: Be itknown that I; WILSON R. 1 11mm cit-iin the county'of Shawnee and State of Kansas, have invented certain new and useful Im- .provements in Compressed Air-Locomotive Heaters; and I' do hereby'declare the following to be a run; clear, and exact description i .of'theinvention, such as will enable others o, shilledin the art to which it appertains to unake and use the same, reference being had to the accompanying drawings, and to the letf l ters of reference marked thereon, which form a part of this specification.

a I heaters for' com pressed-air locomotives in which the air,

previously compressed, is expanded and becomes in this form possessed of the energy used to drive the engine of the locomotive.

result in such a manner that the intense heat applied shall act indirectly on the flues and other heatingsurfaces of the heater proper, to the end that unequal expansion and con- 2 5 traction due to the sudden application of a hot flame to a cold surface is overcome by presenting a protecting-surface of metal that 'shall in no wise detract from the value of-the application of the heat applied. I attain these 59 object-s-bythe mechanical devices illustrated in the accompanying drawings, in which Figure 1 is an exterior view. Fig; 2 is a vertical section taken through the line a l) of Fig. 4, taking into consideration only such parts of the interior of such figure (which is l for allpurposes consideredas aperfected plan view) as practically appear upon the line of intersection. Fig. 3 is a plan view of the base ofthe heater, illustrating the position of the 4p burners as regards the lines. Fig. 4 is a top view with the cone .and base removed, giving the approximate location and proportionate sizeof the flue. Fig. 5 is an exterior view of the flue-protector, and Fig. 6 is a top view 5 giving details of the cap.

Similar letters refer to similar parts throu gh- "out the several views. 7

The body of the heater A is of steel and of the usual conformation and proportionate 5o strengths. The flues B, however, are made considerablylarger that they may receive the owl PRESHSEDA-AI R-LOCOMOTWE H EATER.

'zen o fi-the United States, residing at To peka,

The object of my invention is to attain this PATENT Fries.

y wlLson R. PRATT, or TOPEKA, KANSAS.

SEEQIFIQATIQN forming part of Letters Patent No. 732,892, dated July 7, 1903.

Application filed Otober 15,1901. Serial No. 73,743. No model.) i

flue-protectors C, which constitutes the basic idea of my invention. The said flue-protectors O approximate the hollow conical conformation shown in Fig. 2 and Fig. 5', the mouth of the cone being flared into the form of an ogee mold C, that the flame may only strike inside the said protectorsl Theslotted openings K may vary in size and in number as occasion and experience may dictate. I have preferably shown them as slots and evenly distributed throughout the circumference and length of the cone. On the upper and small end of the protecting-cone C is the cap L, which may be attached to the said cone by any suitable device. The said cap L forms the support of the cone, the outer circumference of the lower end of the said cones C leaving simple nlearance in the lower end ofthe flues B.- The-cap L has several openings L and L through its face to allow for proper draft. by the usual form of cone D with the stack 0. Compressed air may be admitted to the heater A through the opening N or at any other convenient point. The base-M of the heater A possesses no distinctive features of formation. It is preferably shown as of castiron, with doors R and special draft-holes P. The plan of the burners is shown at E E, Fig. 3, and corresponds with the plan of the fluesB of Fig. 4. Oil is taken in through the feed-pipes 35 F, said pipes being shown as forming the support of the burner-rings. The heated air is taken from the heater through the pipe G, the same being controlled by the indicated throttle-valve G, the heated air passing to the cylinders of the locomotive through the feed-pipes G G.

In operation, the oil or gasolene being turned on, the burners E are lighted, and the flames thereof enter the mouth C of the protectors C. The tendency of the flame will be to crawl up the interior of the said cone 0, seeking an outlet through the slots K, yet lacking sufficient force to come in direct contact with the flues B, the more especially as there will be a strong current of air surrounding the interior circumference of said flues, said current continually ascending and of thecap of the flue-protector C. As the The top of the heater A is protected .2- I reasee fire-box M Wil1,;in-'a sens" fullof flame and ing the shields above the flame of the harm heat, all exposed partsot heater will be ers, substantially as described. I Subject to contact with the c d'heat without 3. The combination with the casing, hav- ,being exposed to the direct'action of the ing an inlet and aplurality of fines arranged flame. therein, apertured conical'shields arranged 3:: Having thus described my invention, what in the said fluestapertured oaps'secnred on I claim as new, an'ddesire tosecure by Letters the upper ends of the said shields, and an Patent, is I r outlet-pipe projecting upwardly within the 1. In a compres 'sed-air'lneater, the combisaid casing, substantially as -and for the pur- I nation with a'easingofinletand outlet means posespecified. 35 for conductingair into and out'of saidoasg 4. The combination of a compressed air ing, burners mounted in the casingyfiues in heater,fluestherein,coniealprotectingashields said casing, hollow protecting-shields mountarranged in the said fines said shields being ed in said fines, to receive the flame from-thev apert-ured and havingtheirlowerends flared, burners of the beaten; and apertured supand apertured caps'on' the npper'ends of the s porting means for the shield for holding the said Flues,- said caps engaging the upperends I same above the burners, said means engagi of the 'saidflu'es, substantialiy as and for the ing the fiues, substantially as dscribed. purpose specified: I V r 2. In a compressed-air heater, the eombi 'In testimony whereoflaffix my signature nation of a casing, inlet and-outlet means for in the presence of two Witnesses; I the air, fluesin said easing,protecting-shields' D Within thefines, said shields being tapered I inwardly and having flared mouths to re- Witnesses: ceive the flame of the heaterburners, and vF. O. BURKET,

supporting means ve'n s ;aging thefiues for hold- W. iS. MCCLINTOCK., 

